Package

esptool-js

This repository contains a Javascript implementation of [esptool](https://github.com/espressif/esptool), a serial flasher utility for Espressif chips. `esptool-js` is based on [Web Serial API](https://wicg.github.io/serial/) and works in Google Chrome and

v0.7.0Apache-2.0ESM onlyTypes: Bundled

$ npm install esptool-js

npm GitHub Homepage

Key numbers

As of 25 Sept 2026

Weekly downloads: 27.2k; +791% over 12 months
Gzip bundle size: -; No Bundlephobia data
Dependencies: 2; Direct, from package.json
Last release: -; v0.7.0
GitHub stars: 533; 181 forks
Open issues / PRs: 24 / 12
Contributors: -
Commits, last 52 weeks: 32

Downloads

Last week 2026-09-15 to 2026-09-21

Weekly npm downloads, one point per week, weeks starting 23 Sept 2025 to 15 Sept 2026. The y axis starts at zero.

27,238 downloads last week, 118,796 in the last month. The 12-month change of +791% compares the average of the last 4 weeks with the first 4 weeks of the series.

Maintenance

Releases, last 12 months: -
Latest version: 0.7.0
First published: -
Last push to GitHub: 21 Sept 20263 days before the snapshot
Repository archived: No
Open issues: 24
Open pull requests: 12
Commits, last 52 weeks: 32
Dependents on npm: -

Major versions

Recent releases

Compatibility

Module format: ESM onlyFrom package.json type, main and exports fields
TypeScript types: Bundled
Node.js engine range: Not declared
Runtimes: -
Unpacked size (npm): 834 kB
Dependencies (2): pakoatob-lite

Install

npm install esptool-js

CDN

jsDelivr: 84.3k requests in 30 days

jsDelivrhttps://cdn.jsdelivr.net/npm/esptool-js@0.7.0/
unpkghttps://unpkg.com/esptool-js@0.7.0/
esm.shhttps://esm.sh/esptool-js@0.7.0

Sources: npm registry, npm downloads API, GitHub API, jsDelivr. Data fetched 25 Sept 2026.

Indexability: Not indexed (discovery only): no category.